The results of a rxn that isn't full of gak just can't be compared to one that is. Then there is the waste of resources you mention, and shitty yeilds...SWIP would rather come out with twenty percent yeild of clean than seventy percent of dirty feedstock.
Another convert. You know now why I prefer an a/b extraction with a 60% yield of really clean pseudo to a higher yield of almost clean pseudo extracted with alcohol. There is a simple of rule of thumb involved here: The cleaner the feedstock the better the dope.
The restrictions on pseudo purchases where I live make it difficult for me to experiment with extraction techniques. I suspect this method could incorporate the step of precipitating the pseudo in hot solvent to great advantage. I have the hunch that the remaining impurities can be cleaned out by precipitating in naptha or a xylene/naptha mixture. Precipitating pseudo in hot solvent removes some crystallization inhibitors. Pseudo cleaned this way usually crystallizes more readily.